$ git clone -n https://src.fedoraproject.org/rpms/mozjs128.git /var/lib/mock/f41-build-3151856-40566/root/chroot_tmpdir/scmroot/mozjs128
Cloning into '/var/lib/mock/f41-build-3151856-40566/root/chroot_tmpdir/scmroot/mozjs128'...
$ git fetch origin b7d4ef846aa1e269c3e0caf0d55259044ac02b63:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mozjs128
 * [new ref]         b7d4ef846aa1e269c3e0caf0d55259044ac02b63 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7d4ef8 Fix ELN build for icu-76